It would seem like an emergency event at first glance. The “Choose Your Ride” campaign has been ongoing for the past few weeks, in collaboration with various police departments, BCAS, along with TransLink. Explains why 9717 was there :)

Saw 9610 on the back of a Unitow about 10 minutes ago headed WB on Kingsway at Royal Oak, presumably going back to BTC.
Edit: T-Comm history shows 9610 never completed its block on the 106, with 9464 taking over.

https://engage.gov.bc.ca/broadwaysubway/early-works/
"On behalf of the project, crews from TransLink and the City of Vancouver will be installing trolley poles and wires and upgrading intersection signals and lampposts along portions of:
Macdonald Street, between 4th Avenue and Broadway Avenue;
12th Avenue, between Arbutus and Granville Street, and Oak and Cambie Street; and
Cambie Street, between Broadway Avenue and 12th Avenue."

Amazing what you come back to on the board after work... Can we not?
Back on track, 18173 and 18200 appear in the background at the media event announcing the rollout of Shaw Wifi throughout the system. At Hamilton I believe?

So that explains the cruiser with damage sitting in the detachment parking lot I saw the other day. A brief search yields this Burnaby Now article:
https://www.burnabynow.com/news/five-sent-to-hospital-after-rcmp-vehicle-and-transit-bus-collide-in-burnaby-1.23431563